"Even when you look back to season one when Khal Drogo gives the golden crown to Viserys and her reaction to watching her brothers' head melted off. He was a terrible brother … but there is something kind of chilling about the way that Dany has responded to the death of her enemies," Benioff said.

The pair go on to say they think that without the events of this season, things would have gone differently.

"If circumstances had been different I don't think this side of Dany would have ever come out. If Cersei hadn't betrayed her, if Cersei hadn't executed Missandei, if Jon hadn't told her the truth. If all these things had happened in a different way, then I don't think we'd be seeing this side of Daenerys Targaryen," Benioff said.

But that doesn't mean this turn towards destruction was premeditated in their eyes.

According to them, it was a literal snap decision for Daenerys.

"I don't think she decided ahead of time that she was going to do what she did. Then she sees the Red Keep, which is to her the home that her family built when they first came over to this country 300 years ago," Weiss said.

"It's in that moment, on the walls of King's Landing where she's looking at that symbol of everything that was taken from her, when she makes the decision to make this personal."